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I have had 4 cracked manifolds so far with my GTM kit. 1 time on the right side and just discovered that the left side is cracked again for the 3rd time. Flex joints were added to exhaust before the last set of manifolds were installed but still manifold cracked after less than a few thousand miles. Would love to get my hands on those stainless manifolds. I have emailed the above mentioned shop. No reply yet but I'm hoping they get back with me.
I asked Tim at SFR the orher day if he could build me a new manifold if my pos GTM one ever breaks..he says sure, so you may try SFR...the guy can build anything but he IS slow.....